Cooking with grape juice.

So - long story short - I'm planning a dinner for in a couple of weeks, and for my salad dish I'm choosing to make the poached pear salad from the book "Gather: The Art of Paleo Entertaining" by Hayley Mason and Bill Staley. The recipe calls that I poach the pears in grape juice. I'm wondering if anybody has any suggestions for a more Paleo-friendly juice, or if you think it really matters since I'm just using it to poach the pears and won't be using it for drinking. Thank you so much :)